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Panasonic
Number: E10-2010-08
Technical Bulletin
Date: September, 2010
Panasonic Home and Health Company
Home Appliance Group / Food service
Product: Commercial Mircowave Oven
Model:
NE1258R NE1257R NE1757R
NE2157R
Subject:
Pro 1 Error Codes
NOTE: If the unit is either dead or displays any of the error codes listed below, check the parts listed in
possible cause column depending on failure indication e.g. F81, F82 in the display or no display (dead).
* Please see back of this page on how to troubleshoot F81/F82 error code or dead unit
DISPLAY CONDITION POSSIBLE CAUSE (In order of probability)
F33 Open temperature sensor (exhaust)
1. Loose ground screw on the digital programmer circuit
2. Loose connector CN4
3. Open temperature sensor (Should read 25k to 85k)
4. Digital programmer circuit failure
F34 Short temperature sensor (exhaust) (Rare)
1. Digital programmer circuit failure
2. Temperature sensor failure
F44 1. Shorted membrane switch
F01 Exhaust temperature exceeds 120° C 1. Burning food in the oven due to overcooking
F05 Memory failure 1. Digital programmer circuit failure
No Display* (Dead) No voltage supply to the LV transfomer
1. Right fuse open
2. Damaged short switch
3. Shorted H.V capacitor, transformer, diode or magnetron (upper)
4. Shorted L.V transformer (Relay board)
5. Digital programmer circuit failure
F81*
Excessive current comsumption
(upper H.V circuit)
1. Open primary latch switch
2. Relay failure RY-3 (Relay Board)
3. Digital programmer circuit failure
F82*
Excessive current comsumption
(
lower
H.V. circuit)
1. Left fuse open
2. Open primary latch switch
3. Damaged short switch
4. Shorted H.V capacitor, transformer, diode or magnetron (lower)
5. Relay failure RY-4 (Relay Board)
6. Digital programmer circuit failure
F86 Shorted contacts of RY-3
1. Relay failure RY-3 (Relay Board)
2. Digital programmer circuit failure
F87 Shorted contacts of RY-4
1. Relay failure RY-4 (Relay Board)
2. Digital programmer circuit failure
1. Check for proper grounding before troubleshooting.
2. Use caution when servicing high voltage circuit.
3. Discharge high voltage capacitors prior to servicing.
4. When checking for continuity of the switches or the high voltage transformer, disconnect one lead wire from these
parts and then check continuity with the AC plug removed. To do otherwise may result in false reading or may
damage your meter.
5. Be sure to ground any static electricity charge built up in your body before handling the D.P.C. board.
6. 120/208/230V AC is present in the shaded area on the power supply circuit board (Terminals of the power relay and
primary circuit of the low voltage transformer). When troubleshooting be cautious of possible electrical shock hazard.
.
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does
not contain warnings or cautions to advice non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technician. Any attempt to service or
re
p
air the
p
roduct or
p
roducts dealt with in this service information b
y
an
y
one else could result in serious in
j
ur
y
or death.